How do I copy my music library from my K50 to an external HD

I would like to copy the music library on my Evo 860 SSD to an HDD and eventually upgrade my SSD on the K50. I am not clear on how to do that. I would appreciate some help including which USB port I use on the K50. Thank you.

External USB device should be formatted as exfat.
Plug into the blue USB ports labelled discs.
You can use File Manager to move, tho most people would probably find using File Explorer or Finder easier to use, navigate to K50 storage, copy and paste to the USB.